Gemini 3.1 Pro Is Now Live Across API, Vertex AI, and NotebookLM
Google has begun rolling out Gemini 3.1 Pro across the Gemini API, Vertex AI, the Gemini app, and NotebookLM. The new model is positioned as Google's go-to for complex, multi-step tasks that demand advanced reasoning — the kind of work where 3.0 Pro was already strong but where 3.1 shows meaningful benchmark improvements. Google is releasing it in preview first, taking a measured approach before enabling full agentic workflow support, suggesting the team wants real-world validation before letting it run autonomously in production pipelines.
For developers, the practical upside is immediate: 3.1 Pro is available today through the Gemini API and Vertex AI, making it accessible to anyone already building on Google's AI infrastructure. Given the scale at which the Gemini API is being used — 85 billion requests in January alone — even incremental improvements in reasoning quality translate to enormous real-world impact across the applications built on top of it.
The rollout to NotebookLM is also worth watching. NotebookLM has become one of Google's breakout AI products, popular for research and document analysis, and plugging 3.1 Pro into it directly upgrades one of the most used Gemini-powered experiences for knowledge workers and researchers alike.